Introduces new admin dashboard pages for alerts, bans, invites, orders, settings, status, and vendors under app/dashboard/admin/. Moves the main admin page to the new dashboard structure and adds a shared admin layout. Updates sidebar configuration and adds supporting components and hooks for admin features.
Moved dashboard path check from KeepOnline to a new KeepOnlineWrapper component for cleaner separation of concerns. Introduced a reusable useKeepOnline hook to encapsulate the online status update logic. Updated layout to use KeepOnlineWrapper and simplified KeepOnline. Minor cleanup in broadcast-dialog.tsx.
